JP2012246876A - Intake structure of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake structure of a motorcycle capable of reliably cooling an electric motor of an electronically-controlled throttle located in the vicinity of an engine.SOLUTION: This intake structure of a motorcycle 1 comprises: a cylinder 45 having a cylinder axial line inclined forward; a cylinder head 47 including an intake port 46 guiding intake air to the cylinder 45; an air cleaner box 18 located above the cylinder head 47; a throttle body 41 including a throttle valve 71 located between the air cleaner box 18 and the cylinder head 47 and adjusting an intake flow rate and located below the air cleaner box 18 and behind the cylinder head 47; an electric motor 68 located behind the throttle body 41 and opening and closing the throttle valve 71; and a bottom wall 89 of the air cleaner box 18 including a guide wind groove 88 guiding travel wind flowing into a clearance between the cylinder head 47 and the air cleaner box 18 to the vicinity of the electric motor 68 from the front side of the throttle body 41.

Description

  The present invention relates to an intake structure for a motorcycle.

  2. Description of the Related Art A motorcycle intake structure having an electronically controlled throttle that drives a throttle valve by an electric motor to adjust the flow rate of intake air is known.

  The throttle body of the electronically controlled throttle partitions a throttle bore as a flow path for guiding intake air from the air cleaner box to the engine. The throttle valve is a valve that opens and closes a throttle bore.

  On the other hand, there is known a motorcycle including an engine that tilts a cylinder axis forward and an air cleaner box that is positioned above (more specifically, directly above) the engine. In addition, the motorcycle includes a fuel tank behind the air cleaner box. The throttle body of this motorcycle is located in a region where the back surface of the engine leaning forward and the lower surface of the air cleaner box are sandwiched. The fuel tank surrounds a region where the throttle body is located in a side view of the vehicle in cooperation with the engine and the air cleaner box. The electric motor is located behind and above the throttle body, and overlaps with the projection of the air cleaner box when the vehicle is viewed rearward (see, for example, Patent Document 1).

JP 2010-84667 A

  A conventional motorcycle in which a cylinder axis is tilted forward has a throttle body and an electric motor in a region surrounded by an engine, an air cleaner box, and a fuel tank. In this area, the engine and the air cleaner box block the traveling wind, so the engine heat is likely to be trapped (it is difficult to escape). Therefore, it is difficult for the electric motor located in this region to sufficiently dissipate heat by the surrounding engine, throttle body, air cleaner box, and fuel tank, and there is a risk of being heated by the engine. Cheap.

  Accordingly, an object of the present invention is to provide an intake structure for a motorcycle that can reliably cool an electric motor of an electronically controlled throttle in the vicinity of an engine.

  In order to solve the above problems, an intake structure for a motorcycle according to the present invention includes a cylinder tilting forward with a cylinder axis, a cylinder head having an intake port for guiding intake air to the cylinder, and an air cleaner above the cylinder head. A throttle body between the air cleaner box and the cylinder head for adjusting the flow rate of the intake air, a throttle body below the air cleaner box and behind the cylinder head, and behind the throttle body An electric motor that opens and closes the throttle valve; and an air cleaner box having a wind guide groove that guides running air flowing into a gap between the cylinder head and the air cleaner box from the front side of the throttle body to the vicinity of the electric motor. With the bottom wall Characterized in that it comprises a.

  ADVANTAGE OF THE INVENTION According to this invention, the intake structure of the motorcycle which can cool the electric motor of the electronic control throttle in the vicinity of an engine reliably can be provided.

1 is a left side view showing a motorcycle according to an embodiment of the present invention. 1 is a left side view showing an intake structure of a motorcycle according to an embodiment of the present invention. 1 is a left side view showing an intake structure of a motorcycle according to an embodiment of the present invention. 1 is a perspective view showing an intake structure of a motorcycle according to an embodiment of the present invention. 1 is a plan view showing an intake structure of a motorcycle according to an embodiment of the present invention. 1 is a rear view showing the periphery of a throttle body of an intake structure for a motorcycle according to an embodiment of the present invention. 1 is a bottom view showing an intake structure of a motorcycle according to an embodiment of the present invention. The bottom view which shows the air duct and air cleaner box of the intake structure of the motorcycle which concern on embodiment of this invention. 1 is a longitudinal sectional view showing an intake structure of a motorcycle according to an embodiment of the present invention. 1 is a longitudinal sectional view showing an intake structure of a motorcycle according to an embodiment of the present invention. The front view which shows the air cleaner box of the intake structure of the motorcycle which concerns on embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a motorcycle intake structure according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a left side view showing a motorcycle according to an embodiment of the present invention.

  In describing the motorcycle 1, the solid arrow F in FIG. 1 is defined as the front, and the solid arrow R in FIG. 1 is defined as the rear. Further, the left hand side when viewed from the passenger of the motorcycle 1 is defined as the left side of the motorcycle 1 and the opposite side is defined as the right side of the motorcycle 1. Furthermore, the head side of the passenger of the motorcycle 1 is defined as the upper side of the motorcycle 1 and the opposite side is defined as the lower side of the motorcycle 1. The direction of each part constituting the motorcycle 1 is the same as that of the motorcycle 1.

  As shown in FIG. 1, a motorcycle 1 according to this embodiment includes a body frame 2, an engine 3 below the front half of the body frame 2, and a steering wheel that is located at the front end of the body frame 2 and can turn left and right. The mechanism 5, the front wheel 6 at the lower end portion of the steering mechanism 5 that contacts the ground, the front wheel suspension device 7 interposed between the body frame 2 and the front wheel 6, and the rear portion of the body frame 2 are swingable in the vertical direction. The swing arm 8 is provided with a rear wheel 11 at the rear end portion of the swing arm 8 that is grounded, and a rear wheel suspension device 12 that is laid between the vehicle body frame 2 and the swing arm 8.

  The vehicle body frame 2 is, for example, a twin tube type frame. The vehicle body frame 2 is connected to the steering head pipe 13 at the front end, a pair of left and right main frames 15 that extend right and left immediately after the steering head pipe 13, and the rear end of the main frame 15. A pair of left and right center frames 16 that extend, and a pair of left and right seat rails 17 that are connected to the rear end portion of the main frame 15 and that gently move up toward the rear of the vehicle.

  The steering head pipe 13 supports the steering mechanism 5 in a turnable manner.

  The main frame 15 branches down immediately after the steering head pipe 13 and gently descends toward the vehicle rear side while expanding. The main frame 15 also serves as a tank rail, and supports an air cleaner box 18 in the upper front half and a fuel tank 19 in the upper rear half. Further, the main frame 15 supports the engine 3 below.

  The center frame 16 holds a pivot shaft 21 extending in the vehicle width direction. The pivot shaft 21 supports the swing arm 8 in a swingable manner.

  The engine 3 is located behind the front wheel 6 and below the main frame 15 and occupies the lower center of the motorcycle 1.

  The steering mechanism 5 is provided in the vicinity of the upper end of each front fork 22, a steering shaft (not shown) that penetrates the steering head pipe 13 and serves as a turning center of the steering mechanism 5, a pair of left and right front forks 22 that extend vertically. A pair of left and right handlebars 23. The handle bar 23 includes a handle grip 25. A handle grip 25 on the right side of the motorcycle 1 is a throttle grip 26.

  In addition, the motorcycle 1 includes a streamlined cowling 27 that covers at least a part of the vehicle, for example, the vehicle body from the front part to the center lower part. The cowling 27 reduces the air resistance during traveling of the motorcycle 1 and protects the rider from the traveling wind pressure. The cowling 27 includes a front cover 28 that covers the front of the vehicle, a pair of left and right side covers 31 that cover the sides of the engine 3, an air cleaner cover 32 that covers the air cleaner box 18, and a seat cover 35 that supports the seating seat 33, And a rear cover 36 that covers the rear of the vehicle.

  The air cleaner box 18 accommodates an air cleaner 37. The air cleaner 37 is an air filter that filters intake air of the engine 3.

  The motorcycle 1 further includes a pair of left and right air ducts 39 that guide air to the air cleaner box 18 and thus to the air cleaner 37 from a suction port 38 that opens at the front end of the front cover 28 and opens forward of the vehicle.

  2 and 3 are left side views showing the intake structure of the motorcycle according to the embodiment of the present invention.

  FIG. 2 is a view showing the periphery of the engine 3 with the cowling 27 removed, and FIG. 3 is a view showing the vehicle body frame 2 further removed from FIG.

  As shown in FIGS. 2 and 3, the intake structure of the motorcycle 1 according to the present embodiment includes a body frame 2, an engine 3 that is below the body frame 2 and leans forward on the cylinder axis C, the engine 3, and the main body 1. An air cleaner box 18 above the frame 15, a fuel tank 19 behind the air cleaner box 18, and a throttle body 41 that guides intake air from the air cleaner box 18 to the engine 3.

  The engine 3 includes a cylinder assembly 42 that is directly under the air cleaner box 18 and between the main frames 15, and a crank assembly 43 that is connected to the lower end of the cylinder assembly 42 and expands forward and backward.

  The cylinder assembly 42 includes a cylinder 45 that tilts forward with respect to the cylinder axis C, a cylinder head 47 having an intake port 46 that guides intake air to the cylinder 45, and a head cover 48.

  The cylinder 45 has a cylinder bore (not shown) that extends around a cylinder axis C that tilts forward. The cylinder head 47 is connected to the upper end of the cylinder 45 and closes the top of the cylinder 45. In addition to the intake port 46, the cylinder head 47 includes an exhaust port (not shown), an intake / exhaust valve (not shown), and a valve mechanism (not shown) that open and close the intake port 46 and the exhaust port, respectively. The head cover 48 is a lid of the cylinder head 47 and closes the upper end of the cylinder head 47.

  The crank assembly 43 includes a crankcase 51 that houses a crankshaft (not shown) and a transmission (not shown).

  The crankcase 51 includes an upper case 52 and a lower case 53 that can be divided vertically. The crankcase 51 is connected to the lower end of the cylinder 45 and thus the cylinder assembly 42 and swells forward and backward. The crankshaft is placed in the front half near the cylinder 45 and the transmission is placed behind the crankshaft.

  The engine 3 includes an electrical component 55 that is located behind the cylinder 45 and forms a valley-like space in cooperation with the cylinder 45. The electrical component 55 is a generator, for example, and may be housed in the crankcase 51 or may be outside the crankcase 51.

  The air cleaner box 18 includes a lower half 56 that covers the cylinder assembly 42 and is sandwiched between the main frames 15, and an upper half 57 that protrudes upward from the lower half 56 to the main frame 15. In addition to the air cleaner 37, the air cleaner box 18 includes a front wall 59 of a lower half portion 56 having an air duct connection port 58 for taking in traveling wind. Since the air duct connection port 58 is in the front wall 59 of the lower half portion 56, the main frame 15 has a through hole 61 in which the air duct 39 is disposed.

  The fuel tank 19 includes a front half 62 connected to the rear portion of the air cleaner box 18 and a rear half 63 that sinks below the seating seat 33. The front half 62 extends higher than the rear half 63, and the rear half 63 extends rearward to ensure the capacity of the fuel tank 19 as large as possible. The front half 62 covers the rear half of the crankcase 51.

  A throttle body 41 that is an intake system of the engine 3 is below the air cleaner box 18 and behind the engine 3 (more specifically, the cylinder head 47), and is connected to the rear surface of the cylinder head 47 via the intake pipe 64, and is connected to the intake port. 46. The throttle body 41 is sandwiched between the left and right main frames 15. The intake pipe 64 is a short rubber tube and supports the throttle body 41 flexibly with respect to the engine 3.

  An exhaust pipe 65 that is an exhaust system of the engine 3 is connected to the front surface of the cylinder head 47 and connected to an exhaust port, and sequentially bypasses the front and bottom surfaces of the engine 3 and extends to the rear of the vehicle.

  The cooling system of the engine 3 includes a radiator 66 and an oil cooler 67. The radiator 66 extends so as to cover the front of the cylinder assembly 42. The oil cooler 67 extends so as to cover the front of the crankcase 51 and is located below the radiator 66.

  FIG. 4 is a perspective view showing the intake structure of the motorcycle according to the embodiment of the present invention.

  FIG. 5 is a plan view showing the intake structure of the motorcycle according to the embodiment of the present invention.

  As shown in FIGS. 4 and 5, the intake structure of the motorcycle 1 according to this embodiment includes an electronically controlled throttle that opens and closes a throttle valve 71 by an electric motor 68 to adjust the flow rate of the intake air.

  The electronically controlled throttle converts the operation amount of the throttle grip 26 into the rotation angle of the throttle pulley 72, measures the rotation angle of the throttle pulley 72 with the accelerator position sensor 73, and electric motor 68 according to the measurement amount of the accelerator position sensor 73. The throttle valve 71 is controlled to open and close by driving the electric motor 68 to drive the throttle valve 71 according to the operation amount of the throttle grip 26.

  The operation amount of the throttle grip 26 is a twist angle of the throttle grip 26 and is a throttle operation amount. The cable 75 extends from the handle 76 to the throttle pulley 72 and transmits the operation amount of the throttle grip 26 to the throttle pulley 72.

  The throttle body 41 has a plurality of, for example, four throttle bores 77 corresponding to the number of cylinder bores (the number of cylinders) of the engine 3. The throttle bores 77 are arranged in the vehicle width direction of the vehicle (that is, the vehicle body frame 2), and are connected to the cylinder bores through the individual intake ports 46, respectively.

  The throttle body 41 is located between the air cleaner box 18 and the cylinder head 47 in the throttle bore 77 and adjusts the flow rate of intake air. The throttle body 41 passes through the plurality of throttle bores 77 in the vehicle width direction of the vehicle body frame 2. And a valve shaft 78 extending in the direction.

  Further, the throttle body 41 has a gap between a half body having two left throttle bores 77 and a half body having two right throttle bores 77.

  The valve shaft 78 is the rotation center of the valve body of the throttle valve 71. There are two valve shafts 78. Each valve shaft 78 is the center of rotation of the two left throttle valves 71 or the right two throttle valves 71 with respect to the four throttle bores 77 arranged in the vehicle width direction. The two valve shafts 78 are substantially in a straight line.

  Further, the intake structure of the motorcycle 1 includes an electric motor 68 that opens and closes the throttle valve 71 behind the cylinder head 47 and a throttle shaft that rotates behind a throttle body 41 and around a rotation axis parallel to the valve shaft 78. And a measuring device 81 that measures an operation amount.

  The electric motor 68 is behind the cylinder head 47, more specifically within the rear projection of the cylinder head 47, and is supported by the rear portion of the throttle body 41. There are two electric motors 68 that are separated in the width direction of the vehicle. Each electric motor 68 is responsible for opening and closing the left two throttle bores 77 or the right two throttle bores 77 with respect to the four throttle bores 77 arranged in the width direction of the vehicle. Each electric motor 68 is located behind an intermediate position between the two throttle bores 77 responsible for opening and closing. The output shafts of the two electric motors 68 are substantially in a straight line, parallel to the valve shaft 78, and extend outward of the vehicle.

  The electric motor 68 is connected to the valve shaft 78 via the planetary gear 82 connected to the output shaft of the electric motor 68 and the link mechanism 83 connecting the output shaft of the planetary gear 82 and the valve shaft 78 in order. The planetary gear 82 is on the output axis of the electric motor 68 and is located behind the throttle bore 77 on the outer side in the vehicle width direction. A pair of link mechanisms 83 are provided on the left and right sides of the throttle body 41, and span the planetary gear 82 and the valve shaft 78. The driving force of the electric motor 68 rotates the valve shaft 78 through the planetary gear 82 and the link mechanism 83, and drives the throttle valve 71 to open and close.

  The measuring device 81 includes a throttle pulley 72 located behind the electric motor 68 and an accelerator position sensor 73 that measures the rotation angle of the throttle pulley 72. The measuring device 81 is supported by the throttle body 41.

  The throttle pulley 72 rotates around a rotation axis parallel to the valve shaft 78 and measures the throttle operation amount. The throttle pulley 72 is further rearward of the electric motor 68 that is rearward of the intermediate position between the two left throttle bores 77.

  The accelerator position sensor 73 has a pair of both ends sandwiching the rotation shaft of the throttle pulley 72.

  The cable 75 transmits the throttle operation from the throttle grip 26 to the measuring device 81 through a gap between adjacent throttle bores 77 in plan view. Specifically, the cable 75 is connected to the throttle pulley 72 located behind the middle position of the two left throttle bores 77 via the upper or lower part of the gap between the two left throttle bores 77 to transmit the throttle operation. To do. Accordingly, the cable 75 does not interfere with the link mechanisms 83 on the left and right of the throttle body 41.

  The electronically controlled throttle includes a throttle position sensor 79 that measures the opening degree of the throttle valve 71 and a second link mechanism 80 that transmits the opening degree of the valve shaft 78 to the throttle position sensor 79.

  There are a pair of left and right throttle position sensors 79, and each throttle position sensor 79 is behind two throttle bores 77 on the center side of the vehicle and is closer to the center side of the vehicle than the electric motor 68.

  The second link mechanism 80 is in a gap between the throttle body 41 halves between the two left throttle bores 77 and the two right throttle bores 77 and spans between the throttle position sensor 79 and the valve shaft 78.

  FIG. 6 is a rear view showing the periphery of the throttle body of the intake structure for a motorcycle according to the embodiment of the present invention.

  As shown in FIGS. 3, 4, and 6, the intake structure of the motorcycle 1 according to the present embodiment is a fuel supply that is sandwiched between a cylinder 45 and an electric motor 68 and connects a fuel tank 19 and a cylinder head 47. A tube 85 is provided.

  The fuel supply pipe 85 includes a cylinder head side connection end 86 that is connected to the cylinder head 47 and is located immediately behind the cylinder head 47 and below the electric motor 68. The cylinder head side connection end 86 is a branch pipe that extends in the width direction of the cylinder head 47 and branches so that fuel can be supplied to each cylinder. The fuel supply pipe 85 is located in a valley-like space formed by the cylinder 45 and the electrical component 55 in cooperation.

  On the other hand, the electric motor 68 of the electronically controlled throttle is located below the top of the throttle body 41.

  The fuel supply pipe 85, the electric motor 68 of the electronic control throttle, and the throttle pulley 72 are located in a valley-like space formed by the cylinder 45 and the electrical component 55 in cooperation, and are connected to the cylinder head side of the fuel supply pipe 85. The end 86, the output axis Cm of the electric motor 68, and the rotation center line Cp of the throttle pulley 72 are arranged in an inverted triangle T in a side view of the vehicle. At least one side of the inverted triangle is along the wall surface of the engine 3 or the wall surface of the electrical component 55 that divides a valley-shaped space formed by the cylinder 45 and the electrical component 55 in cooperation.

  Further, the valve shaft 78, the output axis Cm of the electric motor 68, and the rotation center line Cp of the throttle pulley 72 are substantially on the same plane and are substantially orthogonal to the center line of the throttle bore 77.

  Further, the output axis Cm of the electric motor 68 and the extending direction of the cylinder head side connection end 86 are located in a plane substantially parallel to the center line of the throttle bore 77.

  Next, the air duct 39, the air cleaner box 18, and the electronic control throttle will be described.

  FIG. 7 is a bottom view showing the intake structure of the motorcycle according to the embodiment of the present invention.

  FIG. 8 is a bottom view showing an air duct and an air cleaner box of an intake structure for a motorcycle according to an embodiment of the present invention.

  FIG. 9 is a longitudinal sectional view showing the intake structure of the motorcycle according to the embodiment of the present invention, taken along line IX-IX in FIG.

  FIG. 10 is a longitudinal sectional view showing the intake structure of the motorcycle according to the embodiment of the present invention, taken along line XX in FIG.

  FIG. 11 is a front view showing an air cleaner box of an intake structure for a motorcycle according to an embodiment of the present invention.

  As shown in FIGS. 8 to 12, in the intake structure of the motorcycle 1 according to the present embodiment, the traveling wind flowing into the gap between the cylinder head 47 and the air cleaner box 18 is near the electric motor 68 from the front side of the throttle body 41. A bottom wall 89 of the air cleaner box 18 having an air guide groove 88 that leads to the air is provided.

  The bottom wall 89 of the air cleaner box 18 faces the throttle body 41 or the engine 3 and has four openings 91 connected to the throttle bore 77 in addition to the air guide groove 88. The four openings 91 are arranged in the width direction of the vehicle similarly to the throttle bore 77.

  The air guide groove 88 extends in the front-rear direction between adjacent throttle bores 77 in plan view. Specifically, there are two air guide grooves 88, one air guide groove 88a extends in the front-rear direction between the two left openings 91, and the other air guide groove 88b has two right openings 91. It extends between the front and rear. Therefore, in a plan view of the vehicle, one air guide groove 88a extends in the front-rear direction at an intermediate position between the two throttle bores 77 on the left side of the vehicle, and the other air guide groove 88b has two throttle bores on the right side of the vehicle. The intermediate position 77 extends in the front-rear direction.

  One air guide groove 88 a is also a cutout groove in which a cable 75 for transmitting a throttle operation from the throttle grip 26 to the measuring device 81 is disposed.

  The bottom wall 89 is in front of the throttle body 41 and is behind the front end of the cylinder head 47 and has a first air guide hole 92 that guides air from the air cleaner box 18 to the air guide groove 88.

  The first air guide hole 92 is located upstream of the air cleaner 37 (so-called dirty side) in the air flow in the air duct 39 and the air cleaner box 18, and air that has not passed through the air cleaner 37 is introduced into the air guide groove 88. Lead to. A pair of first air guide holes 92 are opened on the left and right, and each first air guide hole 92 is on an extension line of the air guide groove 88.

  The intake structure of the motorcycle 1 includes a bottom wall 95 of the air duct 39 that has a second air guide hole 93 that is forward of the throttle body 41 and guides air from the air duct 39 to the air guide groove 88.

  The air duct 39 opens at the front end of the vehicle in order to efficiently take the traveling wind into the air cleaner box 18, and gradually separates left and right while branching left and right to bypass the steering head pipe 13 and the steering mechanism 5. After passing around the head pipe 13 and the steering mechanism 5, it narrows and connects to the air duct connection port 58 of the air cleaner box 18.

  The second air guide hole 93 is located behind the radiator 66 located in front of the cylinder 45. A pair of second air guide holes 93 are opened on the left and right, and each of the first air guide holes 92 is located on the outer side in the vehicle width direction than the extension line of the air guide groove 88.

  The intake structure of the motorcycle 1 having such a configuration takes the traveling wind from the air duct 39 into the air cleaner box 18 and sends the intake air to the engine 3 through the throttle body 41.

  By the way, the intake structure of the motorcycle 1 includes an electronically controlled throttle that opens and closes a throttle valve 71 by an electric motor 68 to adjust the flow rate of the intake air. The electric motor 68 is close to the throttle body 41 in order to efficiently transmit the driving force to the throttle valve 71, and thus close to the engine 3, and the heat generation of the engine 3 and the heat generation of the electric motor 68 itself. Susceptible to.

  Therefore, the intake structure of the motorcycle 1 according to the present embodiment guides the traveling wind flowing into the gap between the engine 3 and the air cleaner box 18 to the vicinity of the electric motor 68 by the air guide groove 88 in the bottom wall 89 of the air cleaner box 18. The electric motor 68 is forcibly cooled by air (solid arrow f in FIG. 9). According to the intake structure of the motorcycle 1, since the electric motor 68 can be forcibly cooled by air, the electric motor 68 can be disposed closer to the engine 3 and each functional component around the throttle body 41 can be arranged. The degree of freedom of arrangement increases, and the volume required for accommodation can be reduced.

  Further, in the intake structure of the motorcycle 1 according to the present embodiment, the air in the air cleaner box 18 is caused to flow in the vicinity of the air guide groove 88 and eventually the electric motor 68 by the first air guide hole 92 in the bottom wall 89 of the air cleaner box 18. The electric motor 68 is forcibly air-cooled. According to the intake structure of the motorcycle 1, the air that cools the electric motor 68 is prevented from being heated by a heat source other than the engine 3 in front of the air guide groove 88, for example, the radiator 66.

  Furthermore, according to the intake structure of the motorcycle 1 according to the present embodiment, since the first air guide hole 92 is located behind the front end of the cylinder head 47, the electric motor is driven by a heat source other than the engine 3, such as the exhaust pipe 65. The air that cools 68 is prevented from being warmed.

  Furthermore, according to the intake structure of the motorcycle 1 according to the present embodiment, since the second air guide hole 93 is located behind the radiator 66, the radiator 66 prevents the air that cools the electric motor 68 from being heated. .

  Further, according to the intake structure of the motorcycle 1 according to the present embodiment, the first air guide hole 92 and the second air guide hole 93 are opened to the dirty side of the air cleaner 37, so that unfiltered air is sent to the engine 3. It is possible to ensure the cleanliness of the intake air without any problems.

  Therefore, according to the intake structure of the motorcycle 1 according to this embodiment, the electric motor 68 of the electronically controlled throttle in the vicinity of the engine 3 can be reliably cooled.

1 Motorcycle 2 Body frame 3 Engine 5 Steering mechanism 6 Front wheel 7 Front wheel suspension device 8 Swing arm 11 Rear wheel 12 Rear wheel suspension device 13 Steering head pipe 15 Main frame 16 Center frame 17 Seat rail 18 Air cleaner box 19 Fuel tank 21 Pivot shaft 22 Front fork 23 Handle bar 25 Handle grip 26 Throttle grip 27 Cowling 28 Front cover 31 Side cover 32 Air cleaner cover 33 Seating seat 35 Seat cover 36 Rear cover 37 Air cleaner 38 Suction port 39 Air duct 41 Throttle body 42 Cylinder assembly 43 Crank assembly 45 Cylinder 46 Intake port 47 Cylinder head 48 Head cover 51 Crankcase 52 Upper 53 Lower case 55 Electrical component 56 Lower half portion 57 Upper half portion 58 Air duct connection port 59 Front wall 61 Through hole 62 Front half portion 63 Second half portion 64 Intake pipe 65 Exhaust pipe 66 Radiator 67 Oil cooler 68 Electric motor 71 Throttle valve 72 Throttle pulley 73 Accelerator position sensor 75 Cable 76 Handle 77 Throttle bore 78 Valve shaft 81 Measuring device 82 Planetary gear 83 Link mechanism 85 Fuel supply pipe 86 Cylinder head side connection ends 88, 88a, 88b Air guide groove 89 Bottom wall 91 Opening 92 First guide Air hole 93 Second air guide hole 95 Bottom wall

Claims (7)

A cylinder that tilts the cylinder axis forward;
A cylinder head having an intake port for guiding intake air to the cylinder;
An air cleaner box above the cylinder head;
A throttle body between the air cleaner box and the cylinder head for adjusting the flow rate of the intake air, and a throttle body below the air cleaner box and behind the cylinder head;
An electric motor behind the throttle body for opening and closing the throttle valve;
And a bottom wall of the air cleaner box having an air guide groove that guides the traveling air flowing into the gap between the cylinder head and the air cleaner box from the front side of the throttle body to the vicinity of the electric motor. Two-wheeled vehicle intake structure. The throttle body has a plurality of throttle bores arranged in the width direction of the vehicle,
The intake structure for a motorcycle according to claim 1, wherein the air guide groove extends in the front-rear direction between the throttle bores adjacent in a plan view. The intake structure for a motorcycle according to claim 1 or 2, wherein the bottom wall is provided in front of the throttle body and has an air guide hole that guides air from the inside of the air cleaner box to the air guide groove. The intake structure for a motorcycle according to claim 3, wherein the air guide hole is located behind a front end of the cylinder head. An air duct that opens to the front of the vehicle and guides air to the air cleaner box;
5. The air duct according to claim 1, further comprising a bottom wall of the air duct having a second air guide hole that is in front of the throttle body and guides air from the inside of the air duct to the air guide groove. The motorcycle intake structure described in the paragraph. The intake structure for a motorcycle according to claim 5, wherein the second air guide hole is located behind a radiator located in front of the cylinder. An air cleaner that filters the air that is in the air cleaner box and is sent to the throttle body;
The intake structure for a motorcycle according to any one of claims 3 to 6, wherein the air guide hole guides air that has not passed through the air cleaner to the air guide groove.

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